Total war considers Civilian targets as contributing to the war effort because in total War everyone and everything is a potential target/threat to the enemy. In total war there no rules of war attached every possible means of wining the war is applied including hijacking and using genocidal means to prosecute the war.
Barbed wire was important in Trench warfare because it was used to keep the enemy at bay i.e from getting into the trench or having direct access to the soldiers in the trench
Industrialism had an effect on World war 1 because weapons and ammunition could be mass produced on a scale never before seen during the war. No Man's Land was on of the most dangerous part of the battle field
The primary reason samurai adopted Zen Buddhism was the belief that it strengthened them on the battlefield. They believed that plans and strategy on the battlefield led to death, and Zen helped followers dismiss such thoughts.